<template>
  <div>
    <div id="root">
      <div class="todo-container">
        <div class="todo-wrap">
          <Header :addTodo="addTodo"/>
          <List :todos="todos" :deleteTodo="deleteTodo" :checkTodo="checkTodo" />
          <Footer :deleteAllDone="deleteAllDone" :todos="todos" :checkAllTodo="checkAllTodo" v-show="todos.length"/>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Header from './components/Header'
import List from './components/List'
import Footer from './components/Footer'
export default {
  name: 'App',
  components: { Header, List, Footer },
  data() {
    return {
      todos: JSON.parse(localStorage.getItem('listAll'))||[]      
    }
  },
  methods: {
      //数据在哪里，操作就在哪里
      //添加一个todo
      addTodo(todoObj){
          //去todo中查询是否有同名的todo对象
          const result = this.todos.find(todo =>todo.title===todoObj.title)
         if(result){
             //若有同名的
             alert('相同事件已存在，请核实后在添加！！')
         }else {
             //若没有同名的
             this.todos.unshift(todoObj)
             return true
         }
      },
      //删除一个todo
      deleteTodo(id){
          //过滤掉不想要的todo项
          const fltTodos = this.todos.filter (todo => todo.id !==id)
          //更新数据
          this.todos = fltTodos
      },
      //勾选or取消勾选一个的回调
      checkTodo(id,done){
          console.log('@',id)
          this.todos.forEach((todo)=>{
            if(todo.id === id){
                todo.done = done
            }
          })
      },
      //清除所有已完成的
      deleteAllDone(){
          ///将所有未完成的筛选出来
          const fltTodos = this.todos.filter(todo =>!todo.done)
        //更新数据
        this.todos = fltTodos
      },
     //全选 or 取消全选todo
     checkAllTodo(done){
         this.todos.forEach((todo)=>{
             todo.done = done
         })
     }
  },
  watch:{
      todos:{
          deep:true,
          handler(value){
              localStorage.setItem('listAll'.JSON.stringify(value))
          }
      }
  }
}
</script>

<style >
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>